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MHT CET20243 May 2024Evening ShiftPhysicsThermal Properties of MatterActual

A monoatomic gas is heated at constant pressure. The percentage of total heat used for doing external work is

Options

  1. A30 %
  2. B40 %
  3. C50 %
  4. D60 %

Correct answer

B. 40 %

Step-by-step solution

For constant pressure, Using first law of thermodynamics, aligned & W = Q - U & ~W = mC _ p ~T - mC _ v ~T aligned For monoatomic gas = C_p C_v = 5 3 aligned & C_v= 3 5 C_p & W=m C_p T-m ( 3 5 C_p ) T & W= 2 5 m_p T= 2 5 Q 40 % of heat aligned

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